Hornwort
Ceratophyllum demersum
Hornwort is a rootless floating plant, with fine whorled leaves forming long, feathery stems. Fast-growing and very tolerant, it suits all skill levels. Its cold resistance makes it an excellent companion for goldfish, which nibble its shoots without destroying it.
Parameters
- Water type
- Freshwater
- Min volume
- 20 L
- Temperature
- 15–28 °C
- pH
- 6–8
- Hardness (GH)
- 5–25 °GH
- Adult size
- 60 cm
- Difficulty
- Débutant
Environment
It does well from 20 litres and over a very wide temperature range (15 to 28 °C), pH 6 to 8, which covers both tropical and cold-water tanks. Lacking true roots, it can be left to float at the surface or weighted down at the bottom. Moderate light is enough for it.
Feeding
It draws all its nutrients directly from the water column, without substrate or roots. No CO2 is needed; its fast growth consumes nitrates and phosphates, which naturally limits algae. A light liquid fertilisation maintains dense vegetation.
Tips & tankmates
Very useful for natural filtration and as a refuge for fry, it can nonetheless proliferate: remove the excess regularly. It sometimes sheds needles after a change in conditions, while it acclimatises.
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Information provided for guidance only; it may vary between individuals and conditions. If in doubt about an animal's health, consult a vet.